Pay attention to the prevention and treatment of bitter gourd powdery mildew
Recently, according to a routine survey conducted by the plant protection station of Jiande City in the bitter gourd field in the vegetable base of Huangmugang Village, Hangtou Town, it has been found that powdery mildew of bitter gourd has already begun to emerge. The average disease rate of diseased fields is 16.7%, and the leaf disease rate is 4.2%. And it has gradually increased. Due to the recent wet and dry weather, suitable for bitter gourd powdery mildew, the majority of melon farmers must strengthen the field inspection (including bitter gourd, melon melon, cucumber and other melons), timely prevention and treatment. First, the characteristics of the disease The bitter gourd powdery mildew mainly infects the leaves, it can also harm the stems and petioles, generally does not harm the fruit. In the early stage of leaf damage, white round spots were formed on the front or back of the leaves, and then they gradually spread to the surrounding area and connect into a piece to form a large spot with irregular edges. The diseased leaves gradually became yellow and brittle but generally did not fall off. In severe cases, the entire leaf and vine were covered with white powder, and then the top of the yellow leaf curled, the plants declined, the larvae deformed, and the yield and quality were significantly reduced. When the fall is dry, many black spots appear on the white mold. Generally in high temperature and dry weather is conducive to the spread of germs, humidity is more suitable for disease, but the leaves have water droplets or rainy days when the humidity is too saturated when the spores easily swell and rupture. Therefore, the damage is severe under the conditions of alternating wet and dry conditions. In greenhouses, high temperature, high humidity, lack of light, and no rain, are conducive to disease epidemics. In general, the annual output is reduced by about 10%, and in popular years, the output is reduced by 20%-50%. Second, prevention advice 1, increase the application of phosphorus and potassium fertilizer, not partial nitrogen fertilizer to prevent plant growth and defermentation of premature aging. There is no accumulation of water in the field, and the lower disease and yellow leaves are promptly removed to facilitate ventilation. Prolong the ventilation time of the greenhouse under the condition of ensuring the temperature. 2, medication should be mastered in the initial period, the incidence of the field that field control. Old wards should be sprayed for prevention. The diseased field has been selected by using 25% ibuprofen suspension 1000 times liquid, 50% Tsui Bei dry suspension 3000 to 4000 times, or 12.5% ​​Myclobutanil EC 1500 to 2000 times; In the case of non-pathogenic fields, 50% Tribecidae Suspension was used 5000 times, or 10% of the world's high-water dispersible granules were prevented 1500 times. Control once every 7 days, continuous control 2 to 3 times. Epipyritin and Tribem have good control effect on powdery mildew, and have good therapeutic effect, and can also prolong the harvesting period of crops. However, the use of seasonal crops should not exceed two times, pay attention to alternating use, otherwise it is easy to produce drug resistance. . LED Vanity Light,led tubes mirror bathroom light,fluorescent tube bathroom mirror light Ningbo Wellway Optoelectronic Technology Co.,Ltd , https://www.wellwayopto.com